extern int exam2_1();
extern int exam2_2();
extern int exam2_4();
extern int exam2_5();
extern int exam2_6();
extern int exam2_7();
extern int exam2_8();
extern int exam2_9();
extern int exam2_10_1();
extern int exam2_10_2();
extern int exam2_11();
extern int exam2_12();
extern int exam2_13();
extern int exam2_14();
extern int exam2_7_2();
extern int ex2_2_2();
extern int ex2_2_7();
extern int exam2_15();
extern int exam2_16();
extern int exam2_17();
extern int exam2_18();
extern int exam2_19();
extern int exam2_20();
extern int exam2_21();
extern int ex2_4_1();
extern int ex2_4_2();
extern int ex2_4_3();
extern int exam2_22();
extern int exam2_23();


int main()
{
	//exam2_1();
	//exam2_2();
	//exam2_4();
	//exam2_5();
	//exam2_6();
	//exam2_7();
	//exam2_8();
	//exam2_9();
	//exam2_10_1();
	//exam2_10_2();
	//exam2_11();
	//exam2_12();
	//exam2_13();
	//exam2_14();
	//exam2_7_2();
	//ex2_2_2();
	//ex2_2_7();
	//exam2_15();
	//exam2_16();
	//exam2_17();
	//exam2_18();
	//exam2_19();
	//exam2_20();
	//exam2_21();
	//ex2_4_1();
	//ex2_4_2();
	//ex2_4_3();
	//exam2_22();
	//exam2_23();
    return 0;
}